Use dartfmt on Observatory code

runtime/observatory/lib/src/app/view_model.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of app;
 
 typedef String ValueFormatter(dynamic value);
 
 class SortedTableColumn {
   static String toStringFormatter(dynamic v) {
     return v != null ? v.toString() : '<null>';
   }
+
   final String label;
   final ValueFormatter formatter;
   SortedTableColumn.withFormatter(this.label, this.formatter);
-  SortedTableColumn(this.label)
-      : formatter = toStringFormatter;
+  SortedTableColumn(this.label) : formatter = toStringFormatter;
 }
 
 class SortedTableRow {
   final List values;
   SortedTableRow(this.values);
 }
 
 class SortedTable {
   final List<SortedTableColumn> columns;
   final List<SortedTableRow> rows = new List<SortedTableRow>();
   final List<int> sortedRows = [];
 
   SortedTable(this.columns);
 
   int _sortColumnIndex = 0;
   set sortColumnIndex(var index) {
     assert(index >= 0);
     assert(index < columns.length);
     _sortColumnIndex = index;
   }
+
   int get sortColumnIndex => _sortColumnIndex;
   bool _sortDescending = true;
   bool get sortDescending => _sortDescending;
   set sortDescending(var descending) {
     _sortDescending = descending;
   }
 
-
   dynamic getSortKeyFor(int row, int col) {
     return rows[row].values[col];
   }
 
   int _sortFuncDescending(int i, int j) {
     var a = getSortKeyFor(i, _sortColumnIndex);
     var b = getSortKeyFor(j, _sortColumnIndex);
     return b.compareTo(a);
   }
 
@@ skipping 39 matching lines @@
     if (column != _sortColumnIndex) {
       return columns[column].label + '\u2003';
     }
     return columns[column].label + (_sortDescending ? arrowUp : arrowDown);
   }
 
   dynamic getValue(int row, int column) {
     return rows[row].values[column];
   }
 }